1- Crash Course
In this channel, teachers John and Hank Green provide some excellent video explanations and tutorials on a variety of topics related to World History, Biology, Literature, Ecology, Chemistry, and US History.
This is one of the most popular educational channels on YouTube with over 2 millions subscribers. MinutePhysics, created by Henry Reich, features a plethora of professionally designed videos explaining different scientific phenomena. Some of the topics it covered include: gravity, uncertainty principle, dar matter, and many more.
As its name indicates, this YouTube channel, operated by Scott, provides an interesting collection of videos featuring smart and practical explanations of scientific phenomena.
This is another wonderful YouTube channel that provides video explanations of challenging concepts. Some of the topics it covered in the past include: Do plans get cancer? How do my fingerprints form? The science behind that dress and many more.